2009年4月18日土曜日

A meta-search engine searches multiple search engines at once to return a summary of results. Each meta-search engine uses its own algorithm to search and select the best results from multiple search engines. Your search results will be broader but not always better. Each meta-search engine uses its own algorithm so it's prudent to sometimes search more than one meta-search engine. Some good meta-search engines arewww.dogpile.comwww.mamma.comwww.clusty.com

A couple Deep Web databases that you should be familiar with arewww.lexis.com andwww.westlaw.comThese databases contain content that is not searchable by the traditional search engines. These are examples of fee-based or subscription-based databases. Most law offices have access to Lexis and Westlaw. What about other Deep Web resources? Where are they? How can you get there?

Some common, though less familiar Deep Web databases areProQuest,EBSCOhost andThomsonReutersProQuest provides access to more than 200 scientific journals covering a wide range of topics from the physical and life sciences. EBSCOhost provides access to more than 4,500 full-text journals in biology, chemistry, engineering, physics, psychology, religion and theology. ThomsonReuters provides access to millions of records that include company profiles, industry rankings, investment reports and financial statistics.

Many libraries around the world house specific and special collections of data and documents online. The Web site www.libdex.com/country.htmllists academic, public, national and special libraries around the globe.If you need help with language translation, you can visitwww.babblefish.comtype in your question, get the proper translation and send an e-mail to any reference librarian in the world.

Currently, the widest net you can cast on the Deep Web is located at www.completeplanet.comCompletePlanet describes itself as the front door to the Deep Web databases on the Web and to the thousands of regular search engines -- it is the first step in trying to find highly topical information. By tracing through CompletePlanet's subject structure or searching Deep Web sites, you can go to various topic areas, such as energy or agriculture or food or medicine